Muramusa and Koga (the guy you left as ???)
I don't mind the Zanpakuto arc, but I don't like it either. Those manifestations are the swords true form. Like Zabimaru: it's "true form" is Chimpette and Snakey, but it's released shikai form is a baboon. Same with Hyornimaru: it's true form is an ice-like man, but it's shikai form is a dragon.
The reason Yachiru and Kenny aren't there is because they don't know their Zanpakutos name or manifestation, so they weren't listed.
X3